Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c3b63f57736f52d…

MALICIOUS

PDF

98.1 KB Created: 2021-07-06 07:20:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: cc67d7f214787168f53059f94a6ccfdb SHA-1: c72791679a7198477291bdc2960f6e5515b9e7c4 SHA-256: 0c3b63f57736f52d0719e7bbfc45200ea8a256e8a04225a55b8cd5a7a845c72c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document is identified as malicious by an ML classifier and contains numerous links to compromised websites. The heuristics indicate it functions as a link farm, likely for SEO poisoning or to distribute further malware. The presence of multiple external URIs and compromised CMS upload links points to a coordinated effort to leverage these sites for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 5

  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://synerhu.ru/uplcv?utm_term=by+adding+impurities+in+semiconductor+the+bulk+resistance+of+a+semiconductor PDF link annotation
    • http://aggengr.com/uploads/CMS/file/26713849594.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/45231242251.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853462be7b5---46008275010.pdfIn PDF document text
    • http://teifsepahan.com/files/file/72173910859.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d8e67c853b0---26961354265.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/mme070k2e06h96su9e64l5ugk1/23930027323.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/ddda674cc1dade9b5f48d8cc036b62e8/zomakume.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/qk911os4kkdd1n3dmch12h0nqm/75593868348.pdfIn PDF document text
    • http://inlygiaylynhua.com/upload/files/30927303931.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/21216663637.pdfIn PDF document text
    • http://mamnonlittlesun.com/upload/files/nitaforizex.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/79421849571.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/0paa76opg5k0m3on76hcocfam1/satasisezegomikego.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/fbfc4b3710908d94bdf4e49e9ec88d10/zixan.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/12554379666.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/511ae2cdecd2e5797dcba2d796ec8e55/tasajozixugadi.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/0669ab324d7604ddb264981dd2898adf/67715303058.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4fd84ae98a---podejupuzid.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a528b12eb3c---migiwedukomiwugipuninelav.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/ellmc8ev31rs6i7t9ukjgv9t21/polafiz.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/74502982822.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a12af404ea8---73263895764.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/ng6bsue065tjabr596k7i7o41f/sesajasulokixipe.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010eaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EAA 11564 bytes
SHA-256: 3b6c8cc5f54d0df4ac85fbcb127664b78f141a384ee7038c5a2cd1b05de0b79a
font_01_sfnt_off0001297b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1297B 21200 bytes
SHA-256: c9e45bb8cc9f013b9243a9e6980b639eaebd6ae0a39a022683858a521fd92e6a
font_02_sfnt_off0001624c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1624C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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